NB670 Datasheet, PDF (1/19 Pages) Monolithic Power Systems – 24V, High Current Synchronous Buck Converter With LDO

The Future of Analog IC Technology
NB670
24V, High Current
Synchronous Buck Converter With LDO
DESCRIPTION
The NB670 is a fully integrated high frequency
synchronous rectified step-down switch mode
converter with 3.3V fixed output voltage. It
offers very compact solution to achieve 6A
continuous output current and 9A peak output
current over a wide input supply range with
excellent load and line regulation. The NB670
operates at high efficiency over a wide output
current load range. Constant-On-Time (COT)
control mode provides fast transient response
and eases loop stabilization.
Under voltage lockout is internally set as 4.65 V.
An open drain power good signal indicates the
output is within its nominal voltage range.
NB670 also provides a 3.3V LDO, which can be
used to power the external peripheries, such as
the keyboard controller in the laptop computer.
A 300kHz CLK is also available; its output can
be used to drive an external charge pump,
generating gate drive voltage for the load
switches without reducing the main converter’s
efficiency.
Full protection features include OCP, OVP,
UVP and thermal shut down.
The converter requires minimum number of
external components and is available in QFN16
(3mmx3mm) package.
TYPICAL APPLICATION
FEATURES
• Wide 5V to 24V Operating Input Range
• 3.3V Fixed Output Voltage
• Built-in 3.3V, 100mA LDO with Switches
• 6A Continuous Output Current
• 9A Peak Output Current
• 300kHZ CLK for External Charge Pump
• Low R_DS(ON) Internal Power MOSFETs
• Proprietary Switching Loss Reduction
Technique
• Internal Soft Start
• Output Discharge
• 500kHZ Switching Frequency
• OCP, OVP, UVP Protection and Thermal
Shutdown
APPLICATIONS
• Laptop Computer
• Tablet PC
• Networking Systems
• Personal Video Recorders
• Flat Panel Television and Monitors
• Distributed Power Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
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V_IN=6V
V_IN=8.4V
V_IN=12.6V
V_IN=19V
10 100 1000 10000
OUTPUT CURRENT (A)
NB670 Rev. 1.01
www.MonolithicPower.com
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7/23/2013
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